builtins.fetchgit: Fix bad format string

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libexpr/primops/fetchgit.cc b/src/libexpr/primops/fetchgit.cc
index bd440c8c62ad..6a5b5ac36e6b 100644
--- a/src/libexpr/primops/fetchgit.cc
+++ b/src/libexpr/primops/fetchgit.cc
@@ -63,7 +63,7 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
             else if (name == "rev")
                 rev = state.forceStringNoCtx(*attr.value, *attr.pos);
             else
-                throw EvalError(format("unsupported argument ‘%1%’ to ‘fetchgit’, at %3%") % attr.name % attr.pos);
+                throw EvalError("unsupported argument ‘%s’ to ‘fetchgit’, at %s", attr.name, *attr.pos);
         }
 
         if (url.empty())